Not sure if the flash object with go transparent, it didnt seem to in quick tests... (ah, do you just mean the frame? so the flash object is borderless? that might be possible)

However it would need a closer match of the zoom levels to be meaningful.

Anybody fancy working out a conversion equation? it would probably only need a few points in a spreadsheet, and then to find a line of best fit. (I would do it but I need to get some sleep, will try it if nobody else does tomorrow evening)